CVE-2026-41488

angchain-openai: Image token counting SSRF protection can be bypassed via DNS rebinding

State: Published
Severity: 3.1 Low
Published: Apr 24, 2026
Updated: Apr 27, 2026
Reserved: Apr 20, 2026

Description

LangChain is a framework for building agents and LLM-powered applications. Prior to 1.1.14, langchain-openai's _url_to_size() helper (used by get_num_tokens_from_messages for image token counting) validated URLs for SSRF protection and then fetched them in a separate network operation with independent DNS resolution. This left a TOCTOU / DNS rebinding window: an attacker-controlled hostname could resolve to a public IP during validation and then to a private/localhost IP during the actual fetch.

Scores

CVSS	Score	Vector	Source
3.1	3.1 Low	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N	GitHub_M

Weaknesses

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
langchain-openailangchain-ai	< 1.1.14Affected

References

https://github.com/langchain-ai/langchain/security/advisories/GHSA-r7w7-9xr2-qq2r

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